Appeal for samples of original unexposed Platinotype or Palladiotype papers

[Mike Ware]

Are there any collectors of photographica out there with original samples of William Willis's Platinotype Company papers, in an unexposed, unprocessed condition? These were marketed during 1879-1937 in sealed tins, like baked beans, but it doesn't matter if the tin has been opened. Please contact me privately if you have something to negotiate.

The background to this request is a major research project just initiated by a leading US Museum into the conservation of historic platinotypes and palladiotypes. In order to make simulacra for testing, we need more information on Willis's commercial papers than his patents provide, and are gaining this by analytical investigations of his original materials.